boost::variant的诡异现象引发的思考 boost::variant的诡异现象引发的思

#include #include #include #include #include #include using namespace std; using namespace boost; struct MyPair { template MyPair(const T1&& k, const T2&& v):key(k), value(v){} template MyPair(const T1& k, const T2& v) : key(k), value(v) {} #if 1 //bug fix template MyPair(const T1 &k, const char* v) : key(k), value(string(v)) {} template MyPair(const char* k, const T2& v) : key(string(k)), value(v) {} MyPair(const char* k, const char* v) : key(string(k)), value(string(v)) {} #endif boost::variant key; boost::variant value; }; class test { class my_visitor : public boost::static_visitor<> { public: template void operator()(const T1 &key, const T2 &value) const { //cout << typeid(T1).name()<<":"<< typeid(T2).name() << endl; cout << boost::get(key) << ":" << boost::get(value) << endl; } }; public: test(const std::initializer_list& pairs) :test(begin(pairs),end(pairs)) { } template test(const T& b,const T &d) { for_each(b, d, [](auto &t) {boost::apply_visitor(my_visitor(), t.key, t.value); }); } }; int main() { test t({ {"kl", "111"},{"k2", 123},{"k3",456} }); return 0; }